Use static classes for job timers (#9940)

Marlin/duration_t.h

@@ -23,6 +23,9 @@
 #ifndef __DURATION_T__
 #define __DURATION_T__
 
+#include <stdio.h>
+#include <inttypes.h>
+
 struct duration_t {
   /**
    * @brief Duration is stored in seconds